20858730673 has 4 divisors (see below), whose sum is σ = 22754978928. Its totient is φ = 18962482420.

The previous prime is 20858730671. The next prime is 20858730677. The reversal of 20858730673 is 37603785802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20858730673 - 2¹ = 20858730671 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20858730671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948124111 + ... + 948124132.

It is an arithmetic number, because the mean of its divisors is an integer number (5688744732).

Almost surely, 2^20858730673 is an apocalyptic number.

It is an amenable number.

20858730673 is a deficient number, since it is larger than the sum of its proper divisors (1896248255).

20858730673 is a wasteful number, since it uses less digits than its factorization.

20858730673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896248254.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 20858730673 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty thousand, six hundred seventy-three".